2172565047 has 4 divisors (see below), whose sum is σ = 2896753400. Its totient is φ = 1448376696.

The previous prime is 2172565039. The next prime is 2172565049. The reversal of 2172565047 is 7405652712.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2172565047 - 2³ = 2172565039 is a prime.

It is a super-2 number, since 2×2172565047² = 9440077766892224418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2172564996 and 2172565014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2172565049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 362094172 + ... + 362094177.

It is an arithmetic number, because the mean of its divisors is an integer number (724188350).

Almost surely, 2^2172565047 is an apocalyptic number.

2172565047 is a deficient number, since it is larger than the sum of its proper divisors (724188353).

2172565047 is an equidigital number, since it uses as much as digits as its factorization.

2172565047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724188352.

The product of its (nonzero) digits is 117600, while the sum is 39.

The square root of 2172565047 is about 46610.7825186405. The cubic root of 2172565047 is about 1295.1625039186.

The spelling of 2172565047 in words is "two billion, one hundred seventy-two million, five hundred sixty-five thousand, forty-seven".